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Quarterly Financial Information (Summary Of Quarterly Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 709,368 us-gaap_PremiumsEarnedNet |  | $ 705,237 us-gaap_PremiumsEarnedNet |  | $ 697,889 us-gaap_PremiumsEarnedNet |  | $ 683,701 us-gaap_PremiumsEarnedNet |  | $ 680,892 us-gaap_PremiumsEarnedNet | $ 678,913 us-gaap_PremiumsEarnedNet | $ 675,787 us-gaap_PremiumsEarnedNet |  | $ 662,595 us-gaap_PremiumsEarnedNet | $ 2,796,195 us-gaap_PremiumsEarnedNet | $ 2,698,187 us-gaap_PremiumsEarnedNet | $ 2,574,920 us-gaap_PremiumsEarnedNet
Change in fair value of investments pursuant to the fair value option | (22,824)us-gaap_FairValueOptionChangesInFairValueGainLoss1 |  | (20,528)us-gaap_FairValueOptionChangesInFairValueGainLoss1 |  | 41,412 us-gaap_FairValueOptionChangesInFairValueGainLoss1 |  | 45,699 us-gaap_FairValueOptionChangesInFairValueGainLoss1 |  | (30,593)us-gaap_FairValueOptionChangesInFairValueGainLoss1 | 21,815 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | (78,726)us-gaap_FairValueOptionChangesInFairValueGainLoss1 |  | 43,467 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | 43,759 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | (44,037)us-gaap_FairValueOptionChangesInFairValueGainLoss1 | 45,509 us-gaap_FairValueOptionChangesInFairValueGainLoss1
Income (loss) before income taxes | (28,161)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 37,120 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 136,436 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 102,030 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 11,268 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 54,793 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (24,959)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 90,994 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 247,425 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 132,096 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 135,310 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income | $ (20,956)us-gaap_NetIncomeLoss |  | $ 31,296 us-gaap_NetIncomeLoss |  | $ 94,960 us-gaap_NetIncomeLoss |  | $ 72,649 us-gaap_NetIncomeLoss |  | $ 15,376 us-gaap_NetIncomeLoss | $ 39,570 us-gaap_NetIncomeLoss | $ (9,264)us-gaap_NetIncomeLoss |  | $ 66,461 us-gaap_NetIncomeLoss | $ 177,949 us-gaap_NetIncomeLoss | $ 112,143 us-gaap_NetIncomeLoss | $ 116,911 us-gaap_NetIncomeLoss
Basic (in dollars per share) | $ (0.38)us-gaap_EarningsPerShareBasic | [1] | $ 0.57 us-gaap_EarningsPerShareBasic | [1] | $ 1.73 us-gaap_EarningsPerShareBasic | [1] | $ 1.32 us-gaap_EarningsPerShareBasic | [1] | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.72 us-gaap_EarningsPerShareBasic | $ (0.17)us-gaap_EarningsPerShareBasic |  | $ 1.21 us-gaap_EarningsPerShareBasic | $ 3.23 us-gaap_EarningsPerShareBasic | $ 2.04 us-gaap_EarningsPerShareBasic | $ 2.13 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ (0.38)us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.57 us-gaap_EarningsPerShareDiluted | [1] | $ 1.73 us-gaap_EarningsPerShareDiluted | [1] | $ 1.32 us-gaap_EarningsPerShareDiluted | [1] | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.72 us-gaap_EarningsPerShareDiluted | $ (0.17)us-gaap_EarningsPerShareDiluted | [2] | $ 1.21 us-gaap_EarningsPerShareDiluted | $ 3.23 us-gaap_EarningsPerShareDiluted | $ 2.04 us-gaap_EarningsPerShareDiluted | $ 2.13 us-gaap_EarningsPerShareDiluted
Dividends paid per share | $ 0.6175 us-gaap_DividendsPayableAmountPerShare |  | $ 0.6175 us-gaap_DividendsPayableAmountPerShare |  | $ 0.6150 us-gaap_DividendsPayableAmountPerShare |  | $ 0.6150 us-gaap_DividendsPayableAmountPerShare |  | $ 0.6150 us-gaap_DividendsPayableAmountPerShare | $ 0.6125 us-gaap_DividendsPayableAmountPerShare | $ 0.6125 us-gaap_DividendsPayableAmountPerShare |  | $ 0.6125 us-gaap_DividendsPayableAmountPerShare | $ 0.6175 us-gaap_DividendsPayableAmountPerShare | $ 0.6150 us-gaap_DividendsPayableAmountPerShare |
[1] | The basic and diluted earnings per share do not sum due to rounding.
[2] | The dilutive impact of incremental shares is excluded from net loss position in accordance with GAAP.

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